Rock-drill.



- C. A. HULTQU'IST.

- ROCK DRILL.

APPLICATION PIKED IEB.28, 1810.

Pdtented Dec. 13,1910.

3 BHBETB-BHEET 2.

mum

1 WWI/dz! I 61mm c. A; HIILTQUIST.

BOOK DRILL. APPLIOATIOK rnnn rmma, mo.

Pa tntqd Dec. 13,1910.

3 SHEETS-SHEET 3.

PATENT OFFICE.

i UNITED STATES omutws a. nunreursr, or BISBEE, ARIZONA TERRITORY.

iTottll whom it may concern 11 ii Be it known thatyI, CHARLES A. Hour:

1M UIST, citizen of the United'States, residing 1 at Bisbee, in thecounty of Cochise and Territory of Arizona, have invented certa n newand useful Improvements in Rock-Drills, of

which the following is a'specification. 1 This invention relates to rockdrills and has for its object the provision of a drill of "simple andcompact construction inwhleh wear on the several parts incident to theoperation thereof is reduced to a minimum. A further object is toprovide a novel form of valve for controlling the admission of air "fo'rother fluid to the cylinder.

further object is to provide means for I reciprocating the valve toalternately open and close the inlet ports, and fluid pressure means forpreventing rearward movement of said valve at the end of each stroke.

A further object is'to provide means for rotating the piston, and meansfor balancing the rifle bar of said piston, thus to prevent t the latterfrom 1 cylinder. I w "A further ob'ect is to provide moans "ffwherebythe fiui supply pipe may be'posi- 'tioned on either side of the drillwithout the necessity ofdeta'cliing said fluid supply pipe. A stillfurther Ob ect of the invention is as toincrease their utility,durability and flicien'ey.- 1

l urther objects and advantages will ap- "pear in'thefollowingdes'cription, it being understood that various changes-inform,proportions and minor details of construc- ,tion may be' resorted towithin the'scope of the appended claims. j y For a full understanding ofthe invention """and the'merits thereofand also'to acquire a knowledgeof the details'ofconstruction erence is to be had to the followingdescripion and accompanying drawings, in which: igurel isa'verticalsectional view of a k drill constructed in accordance with myinvention, showing the piston or; hammer at the completion of itsworking stroke, 'g.. .is a similar view showing the piston Orhaminer near'the end of its return'stroke; "Fi" .f3fis a horizontal sectional viewof the "valve; Fig. 4 is an end view; Fig. '5 isa ven ticiil sectionalview showing the construction? or the and ratchet revolvin'g't e piston?binding or wedgi'ng .in the generally to, improve this class-f devicesso and-the means for effecting the result, rcfmechanism max-DRILL.

Specification of Letters Patent. Patented Dee. 13, 1910. Applicationaiearebruar 28,.1910. SerialNo. 546,466.]

Corresponding and like parts are referred to in the following descrition and indicated in all the views of t edrawings by the same referencecharacters.

. The rock drill forming the's ubject matter of ,the present inventionCOIIIPIISGS a cylinder 5 havin" fluid passages or ports 6 and 7 formed1n the op )osite ends thereof and communicating wit a valve chamber 8.The valve chamber 8 is provided with a circumferential inlet port orchamber 9 and oppositely dis osed exhaust chambers or ports 10, whichatter communicate with a common exhaust nipple or pipe 11 extendinglaterally from one side of the drill, as shown. The opposite ends of thevalve chamber 8 are closed by removable plugs 12 and 13.having theirinner ends reduced to form circumferential ports 14 and their outer endsprovided withangular portions 15 so that the same may be convenientlygrasped with a wrench or other suitable v tool to permit the removal ofsaid plu Interposed between the plugs 12and l3 isa stationary plungercomprising 0 ositely disposed heads 16 and l'iconnected y anintermediate stem or rod 18, said stationary plunger extending throughthe valv'e 19. The valve19 is formed with a plurality of spaced disks 20and 21 the outer disks 20 being movable alternately over the exhaust'ports'or chambers 10 and the central disk 21 being irnovable over theinlet plort 9 to control the admissionof fluid to t e 'opposite'ends ofthe cylinder. 5*, l

The valve 19 is provided with a-central bore to receive the connectinstem 18 and is also provided with opposltely disposed chambers orpockets 22 for the reception of the heads 16 and 17 of the stationaryplun- 1n. the walls of the valve and communicating with the chambers 22,as shown. A. duct 25 is disposed on each side of thecylinder and formsasource of communication between tl e'interior of said cylinder and theports 14 so that the fluid in the cylinder may be utilized forshiftingthe valve. I y

One end of the valve. chamber 8 is cutaway to form'a seat 26 for thereception of a T-eoupling or casing 27 to the nlpple 28of which isattached in any suitable nanu s ps a i 9- T i "Q. he p'l'ug' 13is'providedjwithh y y StlE I HB O" which prbjeetsthrough anopening inthe end of the, T-coupling or casing 27 .andis I displacement of thepawls and alsopto' pre provided with terminal threads for enga-gementwlth aclamping nut 31, there being a seat '3it'ormed in theend of thecasing 27 and similar in construction to the seat 26 to prevent theentrance of dirt and other foreign matter to the interior of the casing.

The interior walls of the casing 27 are spaced from he stem 30 to form acircumferential chamber 33 which communicates by a passage 34 with theinlet-portor chamber9 to permit the air from the supply pipe 29'to entersaid chamber 9. Thus it will .32 form in effect bearings for the casing27' heseen that by releasing the nut 31 and rotating or partiallyrotating the T-coupling or casing 27-, the fluid supply pipe 29 may bepositioned on either side of-the drill without. the necessity ofdetaching the supply pipe from the casing. a

It will here he noted that. the seatsQG and when the latter is rotated.the casing being locked inadjnst ,ed position by tightening the nut 31.T f g It will also be noted that the plugs 12 and 13 are approximately.of the same diameter as the valvel9 so that by unscrewing the plugs,said valve 19 may be readily removed from its seat for the purpose ofeffecting any necessary repairs thereto. The plugs heads of thestationary plunger, but also permit the valve 19 -to reciprocatewithinwhich is rifled to receive a correspondingly rifled bar 36, thelatter being provided with an integral head 37, seated in the'rear endof the cylinder 5, as best shown in Figs. 2 and 5 of the drawings. Thehead 37 is provided with a series of substantially spherical sockets38in which are .pivotally mounted locking pawls 39 adapted to engagecorresponding-ratchet teeth 40 formed in the inner face of aretainingring 41. 37 is also provided with intersecting openings 42 inwhich are mounted sliding plungers 43, the... ends of said plungcrsbeing adapted tobear against the adjacent. edges of the pawls.;39 forthe purpose of forcing said pawls in contact with the teeth 40. Theplungers 43 are each preferably formed in two sections having sockets orchambers formed therein for the reception of. coil springs 4-4 so thatthe pawls will normally and yieldably bear against the ratchet teeth4-0. l

(lonnni micating with each socket 38 is a recess 4 adapted to receivethe adjacent pawl 39. the'end wall of each recess being provided with a.curved bearing surface 46 for engagementwith the ad accnt end of thepawl, thus to assist in preventing accideiltal The head "12 and 13 notonly form abutments for the vent undue wear on the same It will here benoted that two of the pawls are in engagement with the adjacent teeththereto for the purpose of turning the drill so or other cutting tool.On the working" stroke of the piston, the pawls 89 will mo e. thedistance of a half tooth and rotate the a rifle bar slightly so as toallow the piston 35 to travel in a straight path. 35

The member 37 is retained within the cylinder 5 by means of alwztsher-17 and a head to. the former being provided with astopshoulder and thelatter being provided with suitable cushioning springs 49 extending goacross the outer surface of" the head, asjbest shown in Figs. 1 and-2-of the drawings.

Auxiliary ports or chambers 50 are disposed on opposite'sides of theinlet port 9 so as to permit the entrance of fluid through the ports 23and 24 to the chambers '22 Of the valve. e H v I Thus it will. be seenthat on t'he rearward or return stroke ofthc piston the air or otherfluid in the front end of thecylinder will "flow through the adjacentduct to ,the'po'rt 1-1 at the rear end of the valve 19. so as to shiftsaid valve and permit the air fronrthe iuiet port 9 to tlmvth'rough' theport? to the rear end ,of the piston. \Vhen 1 the valve 19 is moved tothe position shown in Fig. 1 o't' the dra\vings,"a portion of the airfrom the main supply pipe will enter the rear chamlfer 22 through theports 50 and 24 so as to hold the valve to its seat 1 and prevent rearard movement thereof during the vorkingfstroke of the piston. Vherr thevalve is --in the position above referred to, theair from the port 14 atthe rear of the valve will passfth-rough the "duct v 1: 25 to the frontend of the cylinder and the air in the front end of said cylinderlivilllbe exhausted through the passage" 6 and chamhers 50 and 10 to .thecommon exhaust pipe or nipple '11.. As soon as the duct/leading 129 tothe port H- at-the'front' of'the cylinder is uncovered. the fluid attherear end of said.

cylinder will flow throughsaid ductla l shift the valve 19 in theopposite directionso as to'open up communimition between the inlet port9 and the front end of the cylinder andpermit the discharge of-fluidfront-the rear end of the cylinder through the ports" "I 50 and lt tothe exhaust-,lt, atpo'rtion of the fluid from the inlet port at? thesame 139 with a valve chamber, a piston operating.

within the cylinder, removable plugs forming closures for the oppositeends of said chamber, a stationary plunger arranged within the valvechamber and having its opposite ends Bearing against the inner faces ofthe plugs, a valve mounted for reciprocation on the plunger forcontrolling the admission of fluid to the opposite ends of the cylinder,a duct leading from each end of the valve to the cylinderto permit thepassage of fluid for reciprohating said valve, and fluid pressure meansfor preventing rearward movement of the valve during a partof eachstroke.

2. A rock drill, including a cylinder havinlet andexhaust ports andprovided with a valve chamber, a piston operating within the cylinder,removable plugs forming closures for the opposite ends of the valvechamber, one of which is provided with a stem, a casing spaced fromthestem to form a chamber communicating with the inlet port and providedwith means for attachment to a source of fluid supply. a plungerinterposed between and bearing against the plugs, a valve mounted forrecipchamber, one of said plugs being provided.

rocation on the plunger for controlling the '40 admission'of fluid tothe opposite ends of the cylinder, and a duct leading from each end ofthe valve to the cylinder to permit the passage of fluid forreciprocating said valve.

3. A rock drill including a cylinder having inlet and exhaust ports andprovided with a valve chamber, a piston operating within the cylinder,solid plugs forming closures for the oppositeenc s of the valve with athreaded rod,"a rotary casing surrounding the rod and spaced from thelatter to form a amber communicating with the inlet port nd a source offluid supply, a plunger interposed between and bearing against theplugs, a' valve mounted for reciprocation on the plunger for controllingthe admission of fluid to the opposite ends of the cylinder, and a .nutengaging the threaded end of the rod and bearing against the casing forsecuring the latter in adjusted position.

4. A rock drill including a cylinder having inlet and exhaust ports andprovided with a valve chamber, a piston operating within the cylinder,removable plugs form-- ing closures for the opposite ends of the valvechamber, one of said'plugs being pro-:-

vided with a stem, a casing spaced from and surrounding the stem to forma chamber communicating with the inlet port and an" source of fluidsupply, means carried b the stem and engaging the casing for ho dingplunger interposed between andbearing against the plugs, a valve mountedfor reciprocation on the latter in adjusted position, a

the plunger for controlling the admission:- 1 of fluid to the oppositeends of the cyl1nder,

a duct extending from each end of the valve to the cylinder to permitthepassa e of fluid for reciprocating the valve, an pockets formed inthe valve around the plunger and communicating with the fluid supply.for preventing rearward movement of the valve during a part of eachstroke.

5. A rock drill including a cylinder having inlet andexhaust ports andprovided with a valve chamber, a piston operating within the cylinder,removable plugs forming-closures for the opposite ends of the valvechamber, a stationary rod arranged within the valve chamber and havingits opposite ends provided with enlarged heads bearing against the innerfaces of the plu s, a valve mounted for reci rocation on t e plunger forcontrolling t e admission of.

6. A rock drill including a cylinder having inlet and exhaust ports andprovided.

with a valve chamber, a piston operating within the cylinder, removableplugs forming closures for the opposite ends 0 the va v e chamber andprovided with inner flat bearing faces, a stationary plunger arrangedwithin the valve chamber and having its opposite ends bearing againstthe flat faces of the plugs, a valve mounted for reciprocation on thestationary plunger for controlling the admission of fluid to theopposite ends of the cylinder, a duct extending from each end of thevalve to the interior of the cylinder for reciprocating the valve, andfluid pr essure means for preventing rearward movement of the valveduring a part of each stroke. I

7. A rock drill including a cylinder hav ing inlet and exhaust ports andprovided with a'valve chamber, a piston operating within the cylinder,removable plugs forming closures for the'opposite ends of the valvechamber and provided with circumthe admission of fluid to the oppositeends- 10 reciprocating the valve, there being pockets sitely disposedheads bearing against the flat feces of the plugs a valve mounted forreciprocation on the plunger for controlling of the cylinder, and a ductextending from each end of the valve to the interior of said cylinder topermit the passagevof fluid for formed in the valve to receive the"heads of the plunger and provided with, ports to ermit the admissionof'fluid to said chamrs ,for the purpose of preventing rearward )5movement of the valve during a. part of each stroke. v In testimonywhereof I aifix my slgnature in presence of two witnesses.

CHARLES A. H'ULTQUIST; in. 8.]

Witnesses: J. E. MALDONODO,

I C. HIGH;

